Ampace 21700 Batteries

Stepping up from 18650 to 21700? Ampace's tabless 21700 cells bring more capacity and real current headroom — low internal resistance, minimal voltage sag, and cooler running under heavy, sustained load.

Ampace is a relatively recent entrant in cylindrical lithium-ion, but it has gone straight for the demanding end of the market: tabless, high-drain cells like the JP40 (4000mAh, 70A class) that are built to push real amps.

The tabless construction is the reason these perform the way they do. Older cells route all their current through one small welded tab — a chokepoint that adds resistance and concentrates heat when you lean on them. Tabless cells make contact across the entire electrode edge, which slashes internal resistance. For a pack builder, that translates directly into flatter voltage under load, less heat to manage, and stronger output that holds up through the discharge.

Why builders choose them

• Tabless internal design — lower resistance, flatter discharge, cooler under load
• Built for high continuous current in serious pack builds
• 21700 capacity and energy advantage over 18650 cells
• A competitive high-drain option at a builder-friendly price

Built for

• Power-tool packs and high-drain rebuilds
• E-bike, e-scooter, and light EV battery packs
• High-output RC and performance hobby builds
• Custom 21700 pack assembly where current matters